A centrifugal pump vibrates excessively during operationUpon disassembling the pump it is found that the impeller is out of balanceWithout an available spare, you should （）.<br>A:drill holes through the heavy side of the impeller until it balances<br>B:weld counterweights to the light side of the impeller<br>C:remove metal from the heavy side by machining in a lathe<br>D:acid wash and serape the heavy side until it balances

A centrifugal pump vibrates excessively during operationUpon disassembling the pump it is found that the impeller is out of balanceWithout an available spare, you should （）.
A:drill holes through the heavy side of the impeller until it balances
B:weld counterweights to the light side of the impeller
C:remove metal from the heavy side by machining in a lathe
D:acid wash and serape the heavy side until it balances

出自：海船船员证

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